Question about Audio Players & Recorders
Hello, I have found that the transistor that is in the power supply module is broken. I would like to buy another one or equivalent, but I don't know the reference of such transistor. Any idea? It also would help knowing what DC-voltages the power module has to give to the equalizer (bass and treble) module and the phono "previo" module. (I think that around 8V, but not sure). Thank you very much!
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Posted on Jan 02, 2017
There is a book, "Electronics for Inventors" (check Amazon), that will give you the basics of power supply design and electrical components including general scematics. Without more info on what the PS is supposed to produce in the way of voltage and current, there's not much more to be said.
Posted on Mar 23, 2007
SOURCE: lost power supply
If the desktop charger is the version that can accommodate two radios simultaneously similar to the T5000, then the AC wall adapter or the power supply is 9 volts AC.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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Posted on May 26, 2008
I'm not sure what you mean by 'wide open voltage'. If it's over 17v, the supply may have multiple problems. I don't have the 52kx schematic but other Pyramid supplies have over-voltage protection. There is an SCR that is triggered when the voltage gets to ~17v. This should clamp the output and trigger a shutdown. You should check the 16v Zener diode and the SCR. If the SCR or the Zener is defective, that would prevent the over-voltage from clamping the voltage. Also confirm that the SCR has a solid connection to the ground terminal of the supply. If it's open, that could prevent the clamp from shutting down the supply.
If the voltage is going high, measure the DC voltage from pin 4 to pin 5 of the LM723. It should remain the same at all times. Also measure the voltage from pin 5 to the ground terminal of the supply. That should also remain constant at all times.
Posted on Aug 20, 2008
SOURCE: power supply/ no output voltage
Actually i haven't fixed the problem as yet but i did find some info that would help me to fix problem.
I went to google and entered keyword,,, Electronic parts,,there came up a page,,and i went to several manuf sites till i found a replacement transformer,,then i disassembled the power supply and am now waiting for a replacement transformer.
Posted on Sep 22, 2008
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